>bin/iperf3.exe -c 192.168.1.233 -P 1 -i 1 -p 5201 -f g -t 10      0 [main] iperf3 17636 find_fast_cwd: WARNING: Couldn't compute FAST_CWD pointer.  Please report this problem tothe public mailing list cygwin@cygwin.com


https://cygwin.com/faq.html#faq.using.fixing-find_fast_cwd-warnings